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- ConcurrentHashMap in Java? - Stack Overflow
What is the use of ConcurrentHashMap in Java? What are its benefits? How does it work? Sample code would be useful too
- How does ConcurrentHashMap work internally? - Stack Overflow
The ConcurrentHashMap is very similar to the java util HashTable class, except that ConcurrentHashMap offers better concurrency than HashTable or synchronizedMap does ConcurrentHashMap does not lock the Map while you are reading from it Additionally, ConcurrentHashMap does not lock the entire Map when writing to it It only locks the part of the Map that is being written to, internally
- ConcurrentHashMap vs Synchronized HashMap - Stack Overflow
7 ConcurrentHashMap uses finer-grained locking mechanism known as lock stripping to allow greater degree of shared access Due to this it provides better concurrency and scalability Also iterators returned for ConcurrentHashMap are weakly consistent instead of fail fast technique used by Synchronized HashMap
- Why there is no ConcurrentHashSet against ConcurrentHashMap
But ConcurrentHashMap is implemented using non-blocking algorithms and "low-level" synchronisations without any locks of the whole collection So wrapers from Collections synchronized is worse in multi-threads environments for performance reasons
- java - Is ConcurrentHashMap totally safe? - Stack Overflow
The get() method is thread-safe, and the other users gave you useful answers regarding this particular issue However, although ConcurrentHashMap is a thread-safe drop-in replacement for HashMap, it is important to realize that if you are doing multiple operations you may have to change your code significantly For example, take this code:
- Whats the difference between ConcurrentHashMap and Collections . . .
The ConcurrentHashMap uses very sophisticated techniques to reduce the need for synchronization and allow parallel read access by multiple threads without synchronization and, more importantly, provides an Iterator that requires no synchronization and even allows the Map to be modified during interation (though it makes no guarantees whether or
- java - ConcurrentHashMap computeIfAbsent - Stack Overflow
The implementation of ConcurrentHashMap is quite complex, as it is specifically designed to allow concurrent readability while minimizing update contention At a very high level of abstraction, it is organized as a bucketed hash table
- java - When to use ConcurrentHashMap - Stack Overflow
Use ConcurrentHashMap only when the class where it's being used is thread safe; otherwise the use of a thread safe data structure in a non thread safe class adds to the confusion of the next person looking at the code
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